Our body clock,or natural body rhythm,influences our energy and alertness.Paying attention to it can help us choose the suitable time of day when we best perform specific tasks. The reality,however,is that most of us organize their time around work demands,school deadlines,commuting or social events.Doing whatever your body feels like doing is a luxury in today's fast-paced modem society. But that doesn't mean it isn't worth trying.Obeying our body clock has significant health benefits.Disrupting our natural body rhythm,on the other hand,has been linked to problems such as depression,obesity,or headache,says Steve Key,a biology professor. When the body clock can synchronize(......)the rhythms of its natural processes,it "gives us an advantage in daily life",says Key. According to him,when it comes to cognitive work,most adults perform best in the late morning.As our body temperature starts to rise just before awakening in the morning and continues to increase until midday,our memory,alertness and concentration gradually improve. However,he adds,our ability to concentrate typically starts to decrease soon thereafter.Most of us are more easily distracted between noon and 4 pm. Alertness also tends to fall after eating a meal and sleepiness tends to peak around 2 pm,making that a good time for a nap. Surprisingly, tiredness may increase our creative powers.For most adults,problems that require open ended thinking are often best dealt with in the evening when they are tired, according to a study in the journal Thinking & Reasoning. When choosing a time of day to exercise,paying attention to your body clock can improve results.Physical performance is usually best from about 3 to 6 pm,says Michael Smolensky,a professor of biomedical engineering. Of course, not everyone's body clock is the same,making it even harder to synchronize natural rhythms with daily plans. If we know our natural body rhythm well, we can  _  . A) find out the suitable time to do specific tasks B) organize our time around work demands C) do whatever our body feels like doing D) be sure to be healthy
A


(Question)
Tiny monitoring devices have become an increasingly common way for scientists to study elusive animals that are difficult to track on a day-to-day basis. However, now it seems that smart. seals have caught on to the trick and are using it to their advantage to catch fish! To find out if that is true, a team of researchers from the University of St. Andrews in Scotland selected a group often young grey seals that had neither encountered the ocean nor been exposed to any kind of acoustic tags. The researchers then placed the seals one at a time, inside a pool that contained 20 foraging boxes, only two of which housed fish -- one with tags and the other without. Each seal was allowed to explore the boxes twenty separate times. In order to ensure that mammal was not depending on its memory, the fish were moved to different boxes each time. At first, there was no difference in the amount of time it took the seals to discover the tagged and untagged fish. However, after they had been in the pool a few times, they started locating the tagged fish much faster. To confirm that this indeed was the case, there searchers conducted a second experiment using two boxes -- one with pieces of fish and the other with just acoustic tags. Sure enough, the seals were all attracted to the one that was sending out signals. While this experiment involved only seals, the researchers believe that other marine mammals may also be using the information to catch prey. Sadly, predators like sharks that have been tagged by scientists may be negatively affected, as pings they emit could warn their prey of their presence. Besides potentially messing up nature's food chain, the "dinner bell" effect of the acoustic tags could also mean that the conclusions reached by previous fish studies may not be correct. Now that the secret is out, scientists will have to come up with another way to conduct their studies -- one that is not detectable by the crafty marine animals. After doing the two experiments the researchers most probably concluded that   _  . A) it's really easy for seals to find their prey B) seals can be easily fooled by acoustic tags C) seals are much cleverer than most of the other sea animals D) seals can really make use of the acoustic signals to prey
(Answer)
D


Ques: When Elizabeth Kenny was a little girl, she fell off a horse and hurt her arm. Mrs. Kenny took her to a doctor in Toowoomba, Queensland. In the doctor's, Elizabeth saw many bottles of medicine standing in a row. Since then, she wanted to be a nurse. As soon as she was old enough, Elizabeth was trained in a hospital. After working for some time, she made a surprising discovery. Among her patients were some children who had lost the use of their legs because of polio ( ) . Kenny tried putting hot cloth on their legs and washing them in a special way. The results were great. The children were able to use their legs again. Most doctors would not believe that children could get well in such a simple way. Gradually, however, she became famous. From 1993 on people from many parts of the world brought their children to Australia to receive treatment by this wonderful nurse. She was invited to America where her methods were used in many hospitals. Money was collected to build Kenny foundations which were for polio patients. Kenny died in 1952, but she will long be remembered for her fight against polio. What was Kenny's surprising discovery? A) there were so many polio patients around her. B) Polio children could recover in a simple way. C) Children suffering from polio had refused to use arms D) Among the children some of them suffered from polio.
Ans: D


Prices for the Lunar New Year's eve dinners in 2007, the most important dinner for the Chinese people, will be 5 to 9 percent higher as restaurant reservations boom for the festival, Shanghai Morning Post reported on Thursday. This year, the Lunar New Year's eve festival falls on February 17. The tradition meal, know as nianyefan, is for family reunions in prefix = st1 /Chinaand to enjoy a homecoming feast, similar to Christmas dinners in the west. "Agricultural products are more expensive than previous years, and this directly leads to the prices increase of nianyefan," Xia Xiangqing, a senior official with the Shanghai Restaurants Association, told the newspaper, "Labour and transport also cost more." Up till a few years ago, almost every family in the city ate at home or the home of a close  , with restaurants shutting down for the evening. However, most families in the city now prefer to head out to a restaurant on that night to save the trouble of cooking and cleaning at home. In fact, "if you haven't reserved a table yet, you may be out of luck as most of the city's restaurants are already booked before the new year," Xia said. "In the past, restaurants decided everything," Xia said. "They sometimes refused to return the customers deposit  if they wanted to cancel their reservation." Xia also told the newspaper yesterday that the association is working on some standards for nianyefan to avoid complaints from customers. Which of the follow is TRUE according to the passage? A) Restaurants are usually shut down for the evening during the Spring Festival. B) More and more city families choose to book New Year dinner in restaurants. C) Most of the city's restaurants are already booked from the beginning of a year. D) Restaurants have taken measures to avoid customer complaints this year.

B